package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否未登录
 */
@WebFilter("/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest,
                         ServletResponse servletResponse,
                         FilterChain filterChain)
            throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //获取本次请求路径
        String requestURI = request.getRequestURI();//backend/index.html
        log.info("拦截到请求路径:{}", requestURI);

        //定义不需要处理的请求
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/login",
                "/user/sendMsg",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };

        //判断本次请求是否需要处理
        for (String url : urls) {
            boolean check = PATH_MATCHER.match(url, requestURI);
            if (check) {
                //不需要处理的请求,放行
                log.info("不需要处理的请求,放行");
                filterChain.doFilter(request, response);
                return;
            } else if (request.getSession().getAttribute("employee") != null) {
                log.info("用户已经登录,用户id为:{}", request.getSession().getAttribute("employee"));
                long empId = (long) request.getSession().getAttribute("employee");
                BaseContext.setCurrentId(empId);

                filterChain.doFilter(request, response);
                return;
            }
            //4-2、判断登录状态，如果已登录，则直接放行
            if(request.getSession().getAttribute("user") != null){
                log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

                Long userId = (Long) request.getSession().getAttribute("user");
                BaseContext.setCurrentId(userId);

                filterChain.doFilter(request,response);
                return;
            }

        }
        log.info("用户未登录");
        response.reset();
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

       return;

    }
}
